GMod is a Sandbox Modification. Using GMod you can pose ragdolls. This means can position people from HL2/CS/DoD and change their faces. A big comic book creating community has popped up around this feature. Using GMod you can build. Take props from HL2/CS/DoD and weld them together to make walls. Axis a wheel to it to create a working car. Rope some cans to the back. A big contraption creating community has popped up around GMod - creating such things as Rube Goldberg devices, catapults, cannons, bridges etc.. Using GMod you can make your own weapons. That's right, make your own weapons. Using Lua you can create a custom weapon to do just about anything. If you're new you can change simple things like rate of fire, models, sounds. If you're awesome the world is your oyster, mass changing guns, melon cannons, jetpacks. GMod gives you the freedom to do any of these things in single player or online with your friends.

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Mirrors

Garrys Mod allows the player to manipulate objects and experiment with the physics, often with interesting results due to the Source engine. The construction of complex machines within the game can also be a contemporary spin on the Rube Goldberg machine principle. This is the latest version and has is no longer in active development due to GMOD 10 (a commercial game being released)

New problem after i figured that one out, Everytime I try to play the lvl Construct on gmod 9 it says "Unable to load authentication library, Exiting...." I just learned its not only construct most of my "Create a Server" maps, Another problem (last know one) EVERYTIME I TRY TO JOIN A SERVER IT SAYS MY VERSION DOESNT MATCH THAT OF THE SERVER, EVERY SERVER SAYS THAT!!!!

1. Create a New desktop Icon for gmod
2. Right click on it and go to properties
Yours may say something different, used -gamelaunch or something
3. Under path it will say "C:\Program Files\Valve\Steam\Steam.exe" -applaunch 220 -game "c:\program files\valve\steam\SteamApps\SourceMods\gmod9"

this is what it should be changed to, assuming your path is the same.
4. Change it to look like this "C:\Program Files\Valve\Steam\Steam.exe" -applaunch 215 -game "c:\program files\valve\steam\SteamApps\SourceMods\gmod9"

i got a problem i need to download gmod 9.4 (im not saying that gmod 10 ain't good i just dont got the money)but every time i download it i cant play because a error pops up right on the main game screen of it and it says mount file system failed and then it says alot of stupid stuff, also i tried getting on servers but it says i dont got third party mod but i see it right on my screen/ if any of u know what i should do email chris.wilson17@yahoo.com your answer

If only this worked on 360... Its not that I cant afford the game HL2 for PC its just that at the moment I dont have the 2500 dollars to dish out for the beastie (those of you who read pcpp will know what im talking about) Hopefully i will do soon though. Any replies plz send to sykopyro@hotmail.com because it is highly unlikely that i will ever come back to this thread.

i have read these comments, but i have to tell the truth.... yes the ONLY gmod that is updating from team garry is the one that is selling on STEAM. but you don't need all of those, like css,hl2, you need to require a source game,you don't need all of them, just one can run gmod, as long as the game has source sdk.i know this cause i have a steam account and i just saw the buy garry's mod page, and it said: This game requires that you own a Source engine game such as Counter-Strike: Source, Half-Life 2, or Day of Defeat: Source. Click here for a full list of games that meet this requirement.
see as it said OR day of defeat: source. you only need one of those [or others listed that wernt on there],good luck!